An arrowhead is a small, pointy thing that you put on the end of an arrow. When you want to shoot something far away, like a bird or a deer, you put the arrow in a bow and pull back the string. Then you aim and let go of the string. The arrowhead is sharp and pointy, so when it hits the animal, it can hurt or even kill it.
Imagine that you have a pencil and you want to draw a straight line. If you use the eraser end of the pencil, it won't work very well. But if you use the pointy end, you can draw a nice, straight line. An arrowhead is like the pointy end of a pencil, except it's much sharper and can do a lot more damage.
Arrowheads have been used for a very long time, by people who hunt for food or defend themselves. They used to make arrowheads out of rocks, but now they use metal. Arrowheads can come in lots of different shapes and sizes, depending on what they are used for. Some are small and sharp, while others are big and blunt, like a hammer.
Overall, arrowheads are a very important part of archery and hunting, and they help people to catch food or protect themselves.